34.3.2 AMPx Control Register 2(2),(3)
Note:
- Unit voltage = trim step voltage 3 mV. Therefore, the input offest adjustment is between -45 mV and 45 mV.
- When the Op Amp is configured
for gain =
1and the non-inverting input is set to ~VDD/2, positive values of the offset correction (5’b00001-5’b01111) reduce input offset voltage. A negative value of the offset correction (5‘b11110- 5’b10000) increases the input offset voltage. - The offset correction code of k (treated as a signed integer from -16 to +15) will result in a nominal offset voltage adjustment of -3 mV * k. (For example, a code of 00010 ≥ k = 2 will decrease the offset voltage by 6 mV).
| Name: | AMPxCON2 |
| Offset: | 0x3B0C, 0x3B14, 0x3B1C |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| POFFSETHP[4:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| NOFFSETHP[4:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| POFFSETLP[4:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| NOFFSETLP[4:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
Bits 28:24 – POFFSETHP[4:0] Offset Correction for PMOS Differential Input Pair (High-Power mode) bits
Bits 20:16 – NOFFSETHP[4:0] Offset Correction for NMOS Differential Input Pair (High-Power mode) bits
Bits 12:8 – POFFSETLP[4:0] Offset Correction for PMOS Differential Input Pair (Low-Power mode) bits
Bits 4:0 – NOFFSETLP[4:0] Offset Correction for NMOS Differential Input Pair (Low-Power mode) bits(1)
| Value | Description |
|---|---|
| 01111 | Reduce input offset voltage by 15 unit voltage. |
| . . . | |
| 00111 | Reduce input offset voltage by 7 unit voltage. |
| 00110 | Reduce input offset voltage by 6 unit voltage. |
| 00101 | Reduce input offset voltage by 5 unit voltage. |
| 00100 | Reduce input offset voltage by 4 unit voltage. |
| 00011 | Reduce input offset voltage by 3 unit voltage. |
| 00010 | Reduce input offset voltage by 2 unit voltage. |
| 00001 | Reduce input offset voltage by 1 unit voltage. |
| 00000 | No correction from production calibration value |
| 11111 | No correction from production calibration value |
| 11110 | Increase input offset voltage by 1 unit voltage. |
| 11101 | Increase input offset voltage by 2 unit voltage. |
| 11100 | Increase input offset voltage by 3 unit voltage. |
| 11011 | Increase input offset voltage by 4 unit voltage. |
| 11010 | Increase input offset voltage by 5 unit voltage. |
| 11001 | Increase input offset voltage by 6 unit voltage. |
| 11000 | Increase input offset voltage by 7 unit voltage. |
| . . . | |
| 10000 | Increase input offset voltage by 15 unit voltage. |